This week, NBC launches yet another take on the "Jekyll and Hyde" story — and this one might actually be sorta fun. Lemongrab is having children. Seth Gabel is playing a supervillain, and Alaina Huffman is a demon! Obi-Wan Kenobi teams up with Katee Sackhoff! And learn the stories behind the classic superheroes of television.

Tons of clips and details from this week's television below...

Top image: Pioneers of Television: "Superheroes"

Today:

Adventure Time (7:30 PM, Cartoon Network):
Things are getting pretty messed up in lemon-land. Not so lemon fresh, in fact:

"All Your Fault"– Princess Bubblegum sends Finn and Jake to investigate a message of distress from the Earls of Lemongrab.

That's followed by Regular Show and Mad.

Continuum (8 PM, Syfy):
This week, Kiera and Carlos investigate a series of crimes where the victims have holes bored in their skulls and their endocrine fluids removed — could it be something to do with the health problems that acting Liber8 leader Travis is experiencing? This episode packs quite a few surprises, as the jockeying for leadership of Liber8 heats up faster than you might expect.

Being Human (9 PM, Syfy):
Now Syfy's Monday night lineup is basically two Canadian imports, wrapped around a remake of a British import. This week: "The Teens They Are A-Changin'":

Nora and Josh wonder how to deal with a runaway teen; Sally tries to make things right with a ghost and meets a new love interest; and Aidan and Henry continue to look for clean blood.

Lost Girl (10 PM, Syfy):
This week's ludicrous "fae" pun title? "Confaegion." Also, "Bo's houseguest Vex" are the words most guaranteed to make me not want to watch.

Bo's houseguest Vex unwittingly brings trouble to her doorstep when a Morrigan shows up looking for vengeance; and it's up to humans Kenzi and Lauren to swoop in and save the day for their Fae friends.

Also on TV tonight: There's a new Crash & Bernstein at 8:30 PM on Disney XD. Plus The Following at 9 PM on Fox. There's also a brand new Castle on ABC at 10 PM.

Tuesday:

Pioneers of Television (8 PM, PBS):
This week, this Emmy-winning series takes a look at superhero television, from the 1950s Superman show to the 1980s Greatest American Hero series. Check out a clip at left, about the death of George Reeves. Here are the details:

Superheroes crosses many eras: Superman in the 1950s, Batman in the '60s, Wonder Woman and The Incredible Hulk in the '70s and The Greatest American Hero in the '80s. The episode features in-depth interviews with Adam West, Burt Ward, Julie Newmar, Lynda Carter, Lou Ferrigno, William Katt and others. It also includes comments from Robert Culp about his show The Greatest American Hero, recorded just days before he passed away. Narrated by Ryan Seacrest.

Also on TV tonight: There's a new Amazing World of Gumball on Cartoon Network at 7, followed by a new Annoying Orange and a new Level Up!. There's a new Dual Survival at 9 PM on Discovery.

Wednesday:

Arrow (8 PM, The CW):
At long last, it's the start of the "Seth Gabel as the Joker" storyline!

SETH GABEL ("FRINGE") GUEST STARS WHILE THEA FACES PRISON TIME - Thea (Willa Holland) is in trouble with the police after she gets caught using a drug called "Vertigo." Oliver (Stephen Amell) thinks the only way to keep her out of jail is to find the dealer, a man who goes by the name of "The Count" (guest star Seth Gabel). Oliver turns to McKenna Hall (guest star Janina Gavankar), an old flame and current Vice cop, for help. Meanwhile, Laurel (Katie Cassidy) steps in to defend Thea, and Felicity (guest star Emily Bett Rickards) gives Oliver some disturbing news about Moira (Susanna Thompson).

The Neighbors (8:30 PM, ABC):
This show is celebrating getting a full season pickup with an episode called, appropriately, "The Back Nine." And I'm calling it right now — the human family doesn't get into the country club, but their weird and embarrassing alien neighbors do. It's the sort of twist this show would think you'd never see coming.

"The Back Nine" - When the Weavers and Bird-Kersees compete for membership in a brand-new, exclusive country club, they're forced to confront issues of class and race. Marty and Debbie become so obsessed with getting into the club that they blow off their alien neighbors and bring the kids to an open house for prospective members. When Larry and Jacki show up at the club unexpectedly, the results for both families are not what anyone had expected.

Nova (9 PM, PBS):
It's "Who Killed Lindbergh's Baby?"

Supernatural (9 PM, The CW):
What does this show need to spice it up? If you answered "Yet another long lost Winchester relative," then you win a Turducken Slammer, I guess. Oh, and good to see Alaina Huffman getting work.

SAM AND DEAN MEET THEIR GRANDFATHER - Sam (Jared Padalecki) and Dean (Jensen Ackles) are stunned when a man who claims to be Henry Winchester (guest star Gil McKinney), their grandfather, suddenly appears in their hotel room demanding to know where he can find John Winchester. Henry has time-traveled to stop a demon named Abbadon (guest star Alaina Huffman) and was looking for John's help. Through Henry, Sam and Dean learn more about their father and the Winchester blood line.

Also on TV tonight: The first episode of The Americans on FX, that show about a couple of Russian spies under cover in the U.S. in the 1980s.

Thursday:

The Vampire Diaries (8 PM, The CW):
ANOTHER DECADE DANCE. I love that these kids never go to school, but they go to tons of school parties.

DANGEROUS LIAISONS - When Rebekah (Claire Holt) turns down Klaus' (Joseph Morgan) plea to stop Kol (Nathaniel Buzolic) and protect Jeremy (Steven R. McQueen), Klaus turns to Stefan (Paul Wesley) for help. After an angry confrontation with her father, Mayor Hopkins (guest star Rick Worthy), over his unconventional approach to ending the violence in Mystic Falls, Bonnie (Kat Graham) has a frightening run-in with Kol, followed by an unexpected visitor. Klaus complicates the already tense feelings between Stefan and Damon (Ian Somerhalder) by revealing a bit of Stefan's personal life, then surprises Damon by asking for personal advice. Elena (Nina Dobrev) tells Stefan about her dangerous plan for Jeremy, leaving Stefan in a difficult spot. When the high school's 1980s Decade Dance is cancelled by Mayor Hopkins, Stefan finds a charming way to make it up to a disappointed Rebekah.

Beauty and the Beast (9 PM, The CW):
The Hulk is having a serious love triangle here.

VINCENT'S IDENTITY IS THREATENED - Vincent (Jay Ryan) is torn between his new feelings for Cat (Kristin Kreuk) and his old memories with Alex (guest star Bridget Regan). J.T. (Austin Basis) learns that Evan (Max Brown) is planning to propose a task force to catch the beast and must figure out how to stop him. Meanwhile, Tess (Nina Lisandrello) investigates the mysterious skydiving death of the wife of a billionaire adventurer, while Cat remains off duty until she recovers from being shot.

Person of Interest (9 PM, CBS):
We've been waiting so long for John to get reunited with his former partner, and now it's here at last. Hope it doesn't disappoint...

"Dead Reckoning" - Reese is abducted by an old acquaintance planning a massive act of cyber-warfare that could lead to Reese's death.

Do No Harm (10 PM, NBC):
It's worth noting that NBC is the same channel that gave us My Own Worst Enemy not too long ago. In any case, they're back with a new shot at the "Jekyll and Hyde" thing, except that he just has a split personality and there's a magic "pharmaceutical cocktail" that cures it. How long will this last? Four episodes? Five? Read the first episode synopsis and lay your bets:

Renowned neurosurgeon Dr. Jason Cole (Steven Pasquale) has it all - including a dark secret. Every night at 8:25pm, Jason's body is overtaken by a dangerous alternate personality who goes by the name "Ian Price" (also Steven Pasquale). For years, Jason has been able to restrain Ian with the help of an intense pharmaceutical cocktail - that is, until today. Now Ian is free and hell-bent on seeking revenge, which could jeopardize Jason's life, career, and budding romance with Dr. Lena Solis (Alana De La Garza).

Archer (10 PM, FX):
In "Legs," "Archer's fear of cyborgs hits home when Krieger offers to make robotic legs for Gillette."

Also on TV tonight: There's a new House of Anubis on Nickelodeon at 8 PM, plus a new Big Bang Theory at the same time. And a new Deadliest Space Weather on the Weather Channel at 9. And CBS has a new Elementary at 10 PM.

Friday:

Merlin (10 PM, Syfy):
This show races ever closer to its final conclusion. Will you be happy with the way Arthur and Merlin wind up? In any case, by all accounts, this week's episode is not a particularly great one:

Three soothsayers known as the Disir order Arthur to return to the old ways and legalize sorcery, or else Camelot will suffer their wrath.

Also on TV tonight: There's a new Nikita at 8 PM on The CW. And a brand new Phineas & Ferb on Disney at 9 PM.

Saturday:

Star Wars: The Clone Wars (9:30 AM, Cartoon Network):
Check out a clip from this episode that was shown at Comic-Con, featuring Obi-Wan teaming up with Katee Sackhoff's Bo-Katan!

DC Nation (10 AM, Cartoon Network):
On Green Lantern, it's "Cold Fury." Plus Young Justice gives us "The Runaways." Can't find much info about either of those episodes.

Power Rangers: Megaforce (1 PM, Nickelodeon):
It's the 20th season! And there are five new heroes, fighting a brand new evil. Are they saying "It's Mormon time" in this preview, or is that just me? Either way, it looks amazingly 1990s.

Also on TV today: A new Ben 10: Omniverse on Cartoon Network at 9 AM ("Store 23"), and a new Teenage Mutant Ninja Turtles at 11 AM.

Sunday:

There's sod-all on today, due to some kind of sporting event. I think it's called the Puppy Bowl.